and whose complaint to the fbi led to the investigation which uncovered the affair. and there's a growing chorus of questions from lawmakers about exactly when the affair came to light, who in washington was told about it, and when they were told. nbc's kristen walker has the latest on the controversy. >> reporter: according to a senior federal official and close friend of david petraeus, 37-year-old jill kelly complained to fbi agents about being harassed by paula broadwell, david petraeus's biographer. a senior u.s. military official says jill kelly is involved in wounded warrior fundraising in tampa, is married, she and her husband are close petraeus family friends. officials say the downfall started when kelly complained to the fbi that she was receiving intimidating e-mails from broadwell. law enforcement officers tell nbc news that those e-mails tloed the discovery of others between general petraeus and broadwell and were indicative of an extramarital affair. >> my first reaction was disbelief. >> reporter: steven boylen is petraeus's former spokesperson and served with him in iraq.